[UNDERTOW-2617] remove unecessary exception wrapping in MultiPart

Author: baranowb

core/src/main/java/io/undertow/server/handlers/form/MultiPartParserDefinition.java

@@ -253,8 +253,6 @@ public FormData parseBlocking() throws IOException {
                 } else {
                     throw UndertowMessages.MESSAGES.failedToAllocateResource();
                 }
-            } catch (MalformedMessageException e) {
-                throw new IOException(e);
             }
             return exchange.getAttachment(FORM_DATA);
         }
@@ -323,15 +321,12 @@ public void data(final ByteBuffer buffer) throws IOException {
                 throw UndertowMessages.MESSAGES.maxFileSizeExceeded(this.maxIndividualFileSize);
             }
             if (file == null && fileSizeThreshold < this.currentFileSize && (fileName != null || this.currentFileSize > fieldSizeThreshold)) {
-                try {
-                    createdFiles.add(createFile());
+                createdFiles.add(createFile());
 
-                    FileOutputStream fileOutputStream = new FileOutputStream(file.toFile());
+                try(FileOutputStream fileOutputStream = new FileOutputStream(file.toFile());){
                     contentBytes.writeTo(fileOutputStream);
 
                     fileChannel = fileOutputStream.getChannel();
-                } catch (IOException e) {
-                    throw new RuntimeException(e);
                 }
             }
 

core/src/main/java/io/undertow/util/MultipartParser.java

@@ -384,11 +384,7 @@ public void handle(final PartHandler handler, final ByteBuffer rawData) throws I
             try {
                 do {
                     buf.clear();
-                    try {
-                        decoder.decode(rawData, buf);
-                    } catch (IOException e) {
-                        throw new RuntimeException(e);
-                    }
+                    decoder.decode(rawData, buf);
                     buf.flip();
                     handler.data(buf);
                 } while (rawData.hasRemaining());